CROBAR is dead. Long live Studio Mezmor. That’s the name of the new, 35,000-square-foot entertainment complex at 530 W. 28th St., which will open Saturday in what was partially Crobar under the ownership of Bruce Dunston and Joey Morrissey. The space, now undergoing radical renovation, will go back to its artistic roots – it was used to make sets and props for movies and Broadway under the direction of Col. Francis Mess- more in the 1900s. The venue, which also houses Pink Ele phant and an art gallery, will be used for shooting music vid eos, concerts and fashion shows, and will morph into a club on the weekends with deejays including Paul Oaken fold, Danny Tenaglia and Victor Calderone.